looking for hardware on brainwave entrainment

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hi, i'm looking for some hardware and software that has to do with brainwave entrainment that has mic hucked to this device and a box. you see it has to go to my pc, has to do with brainwave entrainment. i don't remember what's the word for it. i seen online a long time ago i mea it's been since 2006. does any budy know what it's called when there is mic to this box that converts speech into brainwaves?